This patch implements section 5.3.4. of RFC6458, that is, support for 'SCTP Send Information Structure' (SCTP_SNDINFO) which can be placed into ancillary data cmsghdr structure for sendmsg() calls. The sctp_sndinfo structure is defined as per RFC as below ... struct sctp_sndinfo { uint16_t snd_sid; uint16_t snd_flags; uint32_t snd_ppid; uint32_t snd_context; sctp_assoc_t snd_assoc_id; }; ... and supplied under cmsg_level IPPROTO_SCTP, cmsg_type SCTP_SNDINFO, while cmsg_data[] contains struct sctp_sndinfo. An sctp_sndinfo item always corresponds to the data in msg_iov. Joint work with Daniel Borkmann.
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| @@ -154,6 +154,22 @@ struct sctp_sndrcvinfo { · 153 unmodified lines | ||
| 154 | 154 | sctp_assoc_t sinfo_assoc_id; |
| 155 | 155 | }; |
| 156 | 156 | |
| 157 | +/* 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO) | |
| 158 | + * | |
| 159 | + * This cmsghdr structure specifies SCTP options for sendmsg(). | |
| 160 | + * | |
| 161 | + * cmsg_level cmsg_type cmsg_data[] | |
| 162 | + * ------------ ------------ ------------------- | |
| 163 | + * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo | |
| 164 | + */ | |
| 165 | +struct sctp_sndinfo { | |
| 166 | + __u16 snd_sid; | |
| 167 | + __u16 snd_flags; | |
| 168 | + __u32 snd_ppid; | |
| 169 | + __u32 snd_context; | |
| 170 | + sctp_assoc_t snd_assoc_id; | |
| 171 | +}; | |
| 172 | + | |
| 157 | 173 | /* |
| 158 | 174 | * sinfo_flags: 16 bits (unsigned integer) |
| 159 | 175 | * |
| @@ -177,10 +193,12 @@ typedef union { · 17 unmodified lines | ||
| 177 | 193 | |
| 178 | 194 | /* These are cmsg_types. */ |
| 179 | 195 | typedef enum sctp_cmsg_type { |
| 180 | − SCTP_INIT, /* 5.2.1 SCTP Initiation Structure */ | |
| 196 | + SCTP_INIT, /* 5.2.1 SCTP Initiation Structure */ | |
| 181 | 197 | #define SCTP_INIT SCTP_INIT |
| 182 | − SCTP_SNDRCV, /* 5.2.2 SCTP Header Information Structure */ | |
| 198 | + SCTP_SNDRCV, /* 5.2.2 SCTP Header Information Structure */ | |
| 183 | 199 | #define SCTP_SNDRCV SCTP_SNDRCV |
| 200 | + SCTP_SNDINFO, /* 5.3.4 SCTP Send Information Structure */ | |
| 201 | +#define SCTP_SNDINFO SCTP_SNDINFO | |
| 184 | 202 | } sctp_cmsg_t; |
| 185 | 203 | |
| 186 | 204 | /* |