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8306266c1d
The fr_hard_header function is used to prepend the header to skbs before transmission. It is used in 3 situations: 1) When a control packet is generated internally in this driver; 2) When a user sends an skb on an Ethernet-emulating PVC device; 3) When a user sends an skb on a normal PVC device. These 3 situations need to be handled differently by fr_hard_header. Different headers should be prepended to the skb in different situations. Currently fr_hard_header distinguishes these 3 situations using skb->protocol. For situation 1 and 2, a special skb->protocol value will be assigned before calling fr_hard_header, so that it can recognize these 2 situations. All skb->protocol values other than these special ones are treated by fr_hard_header as situation 3. However, it is possible that in situation 3, the user sends an skb with one of the special skb->protocol values. In this case, fr_hard_header would incorrectly treat it as situation 1 or 2. This patch tries to solve this issue by using skb->dev instead of skb->protocol to distinguish between these 3 situations. For situation 1, skb->dev would be NULL; for situation 2, skb->dev->type would be ARPHRD_ETHER; and for situation 3, skb->dev->type would be ARPHRD_DLCI. This way fr_hard_header would be able to distinguish these 3 situations correctly regardless what skb->protocol value the user tries to use in situation 3. Cc: Krzysztof Halasa <khc@pm.waw.pl> Signed-off-by: Xie He <xie.he.0141@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
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| .. | ||
| lmc | ||
| .gitignore | ||
| c101.c | ||
| cosa.c | ||
| cosa.h | ||
| dlci.c | ||
| farsync.c | ||
| farsync.h | ||
| fsl_ucc_hdlc.c | ||
| fsl_ucc_hdlc.h | ||
| hd64570.c | ||
| hd64570.h | ||
| hd64572.c | ||
| hd64572.h | ||
| hdlc_cisco.c | ||
| hdlc_fr.c | ||
| hdlc_ppp.c | ||
| hdlc_raw_eth.c | ||
| hdlc_raw.c | ||
| hdlc_x25.c | ||
| hdlc.c | ||
| hostess_sv11.c | ||
| ixp4xx_hss.c | ||
| Kconfig | ||
| lapbether.c | ||
| Makefile | ||
| n2.c | ||
| pc300too.c | ||
| pci200syn.c | ||
| sbni.c | ||
| sbni.h | ||
| sdla.c | ||
| sealevel.c | ||
| slic_ds26522.c | ||
| slic_ds26522.h | ||
| wanxl.c | ||
| wanxl.h | ||
| wanxlfw.inc_shipped | ||
| wanxlfw.S | ||
| x25_asy.c | ||
| x25_asy.h | ||
| z85230.c | ||
| z85230.h | ||